Attachment for handsaws.



UNITED STATES Iatented July 28, 1903;.V

PATENT FFICE.

CHARLES HENRY KOHLER, VOF MARINER HARBOR, NEW YORK;

ATTACHMENT non HAN DSAWS;

SPECIFICATION forming partfof Letters Patent No. 734,892, dated. July 28, 1903A. Application filed Augustaleoz. saranno. 119,106. (Nomad.)

To all whom t may concern.-

Be it known that I, CHARLES HENRY KOH- LER, a citizen of the United States, residing at Mariner Harbor, in the county of Richmond Aand State of New York, have invented a new and useful Attachment for Handsaws, of which the following is a specification. y

The object of my invention is to construct a handsaw which can be used as a rule for laying 0E lines parallel to or at any desired angle to the edge of a board.

Another object of my invention is to so loy cate the level and angle-finder that they will be out of the way while the saw is being used.

In the drawings, Figure l is a side elevation of a saw-blade with my improvements' thereon. Fig. 2 is a plan view of same. Fig. 3 is a horizontal section on the line 3 3 of Fig.

`l. Fig. 4 is a perspective view of the anglending device and the lever and showing the Fig. 5 is a detail horizontal section showing in detail the curvature of the an gie-plate and themanner in which the spirit-level is secured to same.

Inthe drawings,.A represents the blade of a saw, and B the handle. Upon the rear edge of the blade are short transverselines C, dividing the edge into inches andfractions thereof. At theinner endsof these lines,

which are alternately of unequal length, are` apertures C.

Between the handle'and the first of the space-marks is secured a metal plate D, having two straight edges, the one being longer than the other, and its ends forming arcs of a circle.

Along the longer edge an integral flange Dprojects upwardly at a right angle to the plate D. The upper portion of the plate isslotted, as at D2. A beveled bolt-opening is produced in the saw D3, Fig.`3, and the beveled head D.of the threaded screw D5 l'its snugly therein, the head of the bolt lying flush with the side of the saw-blade. The `bolt adjacent theliead is squared, as indicated at D6, a side of the square being equal to the width of the slot. To secure the plate in position, the slot is made to register with the bolt-opening, the

bolt is passed through the squared portion resting in the slot, and a thuin b-nut D7 is secured on the threaded end, binding the plate Vfirmly to the blade. To the lower part of the plate,restingin the angle formed by the flange, is the spirit-level E, clamped in place by the wire members E', as clearly shown in Figs. l and 5.

The plate D is outwardly curved, asis most clearly shown in Fig. 5, where the dotted line represents the saw-blade. The tighteningof the thumb-bolt forces the inner portion of the plate toward the saw, and the plate being of spring metal its opposite edges will bind firmly against the blade and oi'er considerable resistance to movement of the plate relative to the saw. With the pivotal point of the plate as a center an arc of a circle is struck, as shown at F, the arc being divided into degrees.

It is obvious that the blade of the saw can be used as a rule for running parallel lines along a board, for example. In such a case the plate would be placed as shown in Fig. l, the blade of the saw laid flat on the board, angeD resting against the edge of the board. If now a pencil-point be inserted inthe perforation at, say, six inches from the flange and the blade drawn along the board, the flange bearing against its edge, a line will be drawn the length ofthe board six inchesfrom and parallel to the edge. i

To secure an angle, the thumb-nut is loosened and the plate turned along the line F until the edge of the ange reaches the desired inclination, as shown by the scale, when the nut is again tightened.

The application of the spirit-level will of course be readily understood, and it will also be understood that the inch or other scale marks shown at C may be placed on both sides of the saw-blade. Y

Having thus `fully described my invention, what I claim, and desire to secure by Letters Patent, isf 1. The combination with a saw, offa longitudinally and outwardly curved protractorplate secured thereto, said plate being longitudinally slotted, a thumb screw Workin g the forward side of the plate and a spirit-level through said slot, and a graduated scale on secured inthe angle formed by the flange and lo the saw adjacent the protraetor. the plate.

2. In a saw having a scale marked along its 5 rear edge, an outwardly-curved metal plate CHARLES HENRY KOHLER' having a longitudinal slot produced therein Witnesses: detachably Secured to the side of said blade, WILLIAM MERRELL, a ange proj eebin g outward and integral with ERNEST MARKHAM. 

